Reports and Proceedings — Geological Society of London. 329 



in the Museum that the author states have one or other of the 

 mandibles in situ must be regarded as treasures indeed. A figure of 

 one of these specimens is given, showing the mandible upon the 

 surface of the cast of the ventral aspect of the body-chamber. 



The figures in the book are both numerous and excellent, and we 

 feel quite sure that the volume will prove a most valuable addition 

 to our knowledge of the Cephalopoda. 



I^E:poI^TS j^istid :ps,OGEEiDXi<rc3-s. 



Geological Society of London. 



I.— May 27, 1891.— Sir A. Geikie, F.R.S., President, in the 

 Chair. — The following communications were read : — 



The Secretary announced the presentation by Sir John W. Dawson, 

 LL.D., F.R.S., of a series of photographs of Nova-Scotian Coal- 

 Measure Amphibia and Reptilia, and read an explanatory note 

 written by the donor. 



Dr. G. J. HiNDE remarked that additional interest attached to the 

 genus Eylonomus from the fact that a representative of it had lately 

 been discovered in the Burnley Coalfield, and described by Mr. A. 

 Smith Woodward, F.G.S., in the May Number of the Geological 

 Magazine under the name of Hylonomus Wildi. 



1. "On the Lower Jaws of Procoptodon." By E. Lydekker, Esq., 

 B.A., F.G.S. 



After reviewing Sir R. Owen's writings upon the large extinct 

 Kangaroos for which he established the genus Procoptodon in 1874, 

 the author describes two mandibular rami from the clay beds of 

 Miall Creek in the neighbourhood of Bingera, N.S.W., which belong 

 to this genus, and from their characters and a comparison of them 

 with the lower jaws in the British Museum, he maintains that this 

 part of the skull indicates two very distinct species of the genus, for 

 which he retains the names P. rapha, Ow., and P. goUah, Ow., 

 though it is possible that the types of those two species are really 

 specifically identical, in which case the name P. piisio, Ow., might 

 have to be adopted for one of the species described. 



2. " On some recently exposed Sections in the Glacial Deposits 

 at Hendon." By Henry Hicks, M.D., F.R.S., Sec. Geol. Soc. 



In this paper the author brings forward evidence obtained from 

 sections exposed in gravel-pits and deep cuttings made for the pur- 

 pose of laying down the main sewers, to show that Glacial Deposits 

 had been spread out to a much wider extent over the Hendon 

 plateau than had hitherto been supposed, and that they had reached 

 down the slopes to below the ordnance-datum line of 2000 feet. He 

 further mentions that there is evidence to show that these deposits 

 have extended in a S. and S.W. direction across the Brent and Silk 

 Valleys, and now occur on most of the heights in the parishes of 

 Kingsbury and Willesden. As the sands, gravels, and Boulder-clay 

 which cover the Hendon plateau and the neighbouring heights are 

 found to rest on an undulating floor of London Clay, and to follow 



